Cold storage doorlock



Aug. 29, 1933. c. J. ANDERSON 1,924,898

COLD STORAGE DOORLOCK Filed oct. 9, 1929 2 sheets-snee: 1

Aug. 29, 1933. C, 1 ANDERSQN 1,924,898

COLD STORAGE DooRLoGK Filed oct. 9, 1929 2 sheets-sheet 2 Patented Aug. 29, 1933 UhiiTED STATES PATENT OFFICE COLD STORAGE DOORLOCK Application October 9, 1929. Serial. No. 398,298

1 Claim.

This invention relates to a lock designed for use in connection with heavy doors of the kind ordinarily used in cold storage rooms or the like, in which it is necessary to provide means for forcing the door tightly to place within the casing in order to bring pressure to bear upon the packing or gasliet which affords a seal around the margin of the door.

The object of the present invention is to provide a lock which will permit opening from either side of the door; to make provision positively forcing the door to place under spring tension; to provide double springs in order to better equalize the spring action and to permit the lock to operate eifectively, even if one of the springs becomes broken; to provide simple and eifective means for locking the sliding par as occasion may require, and to so arrange the mechanism that there will be no rebound in the handle of the lock when the door is closed.

Further objects and details of the invention will appear from the description thereof in connection with the accompanying drawings in which Fig. 1 is a side elevation of the lock with the door in closed position; Fig. 2 a plan Viewl 'receive the leg screws which secure the lock to the door. The side walls merge into a top cross wall 14, which at its forward end is formed to afford an outwardly extending protuberant roofed-over housing portion 15 having side walls .i6 and a sloping or obliquely disposed outer cross wall 17. rihe side walls 16 extend rearwardly beyond the cross wall 17 in the form of ears 18,

through which is entered a pintle 19 which serves to pivot a handle 2O which extends through .the open rear end of the protuberant housing portion. The pintle extends through the handle near the inner end thereof, and the forward end is inwardly turned to provide a finger 21 which extends obliquely forwardly and then inwardly,

.and is entered into an elongated slot 22 in a sliding bar 23 which slot is closed at its forward and rear ends. The sliding bar, at its forward end 24, is bifurcated to receive a roller 25, and the bar at its rear end is divided to afford a pair of .separated plungers 26, each of which is encircled through which wall the respective plungers extend, so that as the sliding bar is thrust rearwardly it will be guided at its rear end by the two plungers 29 and lat its forward end by its contact with the front wall 30 of the housing.

The flange 12 which extends outwardly from the 65 Y housing and constitutes the base for attachment to the door, is extended rearwardly beyond the rear end wall 29 of the housing, and the side walls 11 of the housing are rearwardly extended to afrol-d lugs 31 which spring. upwardly from the 70 f base flange on opposite sides of the handle and each in proximate relation to one of the plungers, and each of the lugs is provided with an aperture 32 adapted to receive a padlock so that when the padlock is4 in place, and locked, it will 75 Y.

obstruct the rearward movement .of the proximate plunger, thereby preventing the withdrawal of the sliding bar.

In order to permit the'sliding bar to be operated from the opposite side of the door, a push rod 33 is provided which is pivoted within a recess 34 in the handle by means of a pintle 35. The push rod extends through the door, and through a plate 36 on the opposite face of the door which is provided with a packing 37 through 85 which the push rod extends. The push rod terminates in a handle 38, which arrangement permits the handle 20 to be lifted by a thrust from the opposite side of the door. The push rod passes through an elongated slot 39 in the 90' base flange 12, which affords sufficient play to accommodate the movements required.

The roller 25 co-acts with a keeper 40 which is mounted upon a base plate 41 provided with screw holes 42 for securing the keeper to the door 95! casing, and the keeper, as shown, comprises a body portion 43 which springs upwardly from the base plate and presents a rearwardly curving surface 44 toward the roller 25. The .body

portion 43 merges into a shoulder 45 having a 100 beveled under cam surface 46, against which the roller contacts, which shoulder portion merges into an upper wall 47 affording a sloping contact surface 48 for contact with the roller 25. The

upper contact surface 48 and the cam surface 105A f 46 extend at an oblique angle to one another and merge together at a rounded apex 49, around which the roller passes as the door is swung either inwardly or outwardly. The body portion 43, the shoulder 45, and the upper wall 47 of the 1101- keeper are all embraced by side walls 50, the keeper being in the form of an integral casting configured to the shape indicated. As shown, the door is provided with a sealing gasket 51 which engages the outer face 52 of the door opening, but the lock of the present invention is adapted for use with doors o varying formation other than that shown for purposes of illustration.

In use, the door will be opened by grasping the grip portion 51 of the handle 2O and drawing the same outwardly, which exerts a powerful leverage, tending to swing the finger 21 inwardly against the cross-head 28 ofthe sliding bar. This exerts compression on the springs and forces the sliding bar back until the roller 25 clears the rounded apex 49 of the keeper, after which the door may be opened to the fullest extent. The same action will occur if pressure is exerted against the push rod 33. In closing the door, the roller 25 will ride upon the contact surface 48 of the keeper until it passes around the apex 49, and this action will force the sliding bar rearwardly against the tension of the duplicate springs so that as the roller passes over the apex 49, the springs will act to restore the bar to normal position, and in so doing wiil cause the roller 25 to roll along the cam surlace 46, thereby exerting an inward compression against the door lwhich serves to tightly seal the same.

"`uniform compressive action of the Springs Which permits the sliding bar to act evenly and uniformly as the roller engages andA rides upon the keeper. Furthermore, use of duplicate springs is of advantage in that the breakage of a single `spring will not incapacitate the door, and permits an adequate seal to be maintained,untilY repairs can be effected. The Aprovision oi the elongated slot 17 in the sliding bar, aords a clearance which permits the sliding bar to be I-*retracted without movement of the handle, so

that as the roller 25 passes under the keeper and is suddenly thrust forward by the action of the springs, the handle will remain stationary and not be subject to a rebound which might injure the hand of the operator. The duplicate arrangement oi the plungers 26 is of advantage in that it not only affords adequate mountings for duplicate springs, but also permits the plungers to clear the push rod 33 en opposite sides thereof, thereby centering the thrust of the push rod directly in line with the handle which affords a better mechanical arrangement of the parts than if the push rod were decentered to accommodate the movements of the sliding bar. The method of locking one or both of the plungers by the use of a padlock and entered through one or both of the apertures 32 in the lugs 31 affords an easy and convenient arrangement for locking the door in such a way as to effectually prevent tampering of the mechanism. The device, as a whole, is relatively simple and rugged in construction, and the arrangement is one which aiords adequate leverage for retracting the sliding bar against substantial spring tension by a. direct draw on the handle in the direction required in opening the door.

Although the invention has been described with considerable detail, it is not the intention, unless otherwise indicated in the claim, to limit the invention to the device as shown, since modifications thereof -may be made without departing the principle of the invention.

I claim:

A lock of the kind-described in which is combined a' mounting wherein a slidably supported a locking bolt having its rear end terminating in a pair of spaced plungers symmetrically arranged with respect to the center line of the bolt, an operating handle in the form of a lever having one end engaged with the bolt at a point adjacent the center line thereof, and so arranged as to present a substantial portion of itself in lapping relation to the bolt, and a push rod connected to the lever and extending away therefrom in a plane transversely of the bolt and coincident with the center line thereof, the rotative position of the bolt relative to the push rod being such that the latter is disposed centrally between the spaced plungers when the bolt is retracted from locking position.

CHRISTOPHER J. A.NDERSON. 

